feat: dump postgres records

[mmalenic]

Closes #705

Changes

• Adds pg-dd command that can dump the local database, upload/download dumps to S3, and load dumps into the database.
  • This is based on copy ... from/to stdin/stdout SQL command. The reason this is used of pg_dump is because it's easier to embed in a Lambda function, and it allows executing custom sql queries to fetch records (which is used for filemanager).
  • Using Python because psycopg has good support for this compared to TypeScript.
• Deploy this code as a Lambda function which can be used to dump records from the running dev RDS instance to S3.

[victorskl]

LGTM.
I will give it a try soon.

[mmalenic]

Further Updates

• Dockerfile is simplified to call poetry run directly instead of trying to create a multi-stage build, in order to increase compatibility.
• The upload and download commands are more intuitive, they now only read from/write to the output directory, they don't actually connect to the database.
  • There is now an extra option for the upload subcommand --dump-db that allows dumping the database to the local directory first before uploading.

[williamputraintan]

LGTM!

[mmalenic]

No idea why, but for some reason when writing the object with cli download, it gets compressed twice. Fixed with recent commit.

[williamputraintan]

Fixed with recent commit.

Could confirm the fix here, thanks!